41results about How to "To achieve the purpose of anti-interference" patented technology

An antenna switching system for switching between a first antenna and a second antenna, where a gain of the first antenna is different from a gain of the second antenna, is disclosed. The antenna switching system includes an antenna switch unit and a switch control device. The antenna switch unit is selectively coupled to the first antenna or the second antenna. The switch control device is coupled to the antenna switch unit and utilized for controlling the antenna switch unit to switch between the first antenna and the second antenna according to at least a predetermined threshold value and an incoming wireless signal received from the antenna switch unit to achieve some purposes such as reducing power consumption and anti-jamming.

The invention provides a method of radio frequency interference resistance of hop channel in industrial wireless networks and relates to industrial wireless communication networks. The invention is based on the adding of hop channel information and beacon frames of communication protocols of the industrial wireless networks; a coordinator generates and broadcasts hop channel sequences of a system to all devices of a whole network and the hop channel information which contains take-off points of the system and the take-off points of an adjacency system is added into the load of the beacon frames; a router and a terminal device analyze the beacon frames and an unused take-off point is selected as the present take-off point; the coordinator and the router dynamically evaluate the channels of the networks and define the interfered channels by packet loss rates; the coordinator shields the interfered channels; a next channel of the interfered channels in the hop channel sequences replaces the position of the interfered channels in the hop channel sequences; the radio frequency interference between industrial wireless network systems within the scope of the same radio frequency can be effectively avoided. The method can greatly improve the coexistence of industrial wireless network communication environments and the anti-interference capability.

The invention discloses a test device for high-voltage dielectric loss, and relates to a test device. The test device comprises a sine wave output variable frequency power source, a voltage boosting device, a high-voltage standard capacitor, non-grounded test equipment, a high-voltage current sampling isolation unit, a dielectric loss measuring unit, grounded and tested equipment and a display control unit, wherein the sine wave output variable frequency power source can output 0 to 300V and 40 to 70Hz sine waves; the voltage boosting device is used for boosting voltage and connected with the sine wave output variable frequency power source; the high-voltage standard capacitor, the non-grounded test equipment and the high-voltage current sampling isolation unit are connected with the voltage boosting device respectively and are mutually connected in parallel; the dielectric loss measuring unit is simultaneously connected with the high-voltage standard capacitor, the non-grounded test equipment and the high-voltage current sampling isolation unit and is used for amplifying, filtering, synchronously sampling and calculating a tested signal; the grounded and tested equipment is connected with the high-voltage current sampling isolation unit; and the display control unit is respectively connected with the dielectric loss measuring unit and the sine wave output variable frequency power source and is used for controlling a user operation instruction and displaying a measurement result. Due to the structure, the high-voltage dielectric loss test device can have the function of testing the dielectric loss of positive/negative wires at the same time.

The invention provides a vivaldi antenna and a dual-polarized probe, which solves the problems of poor high-frequency cross-polarized levels and low port coupling isolation of existing probe antennas.The technical points are that the vivaldi antenna comprises three metal layers and dielectric plates arranged between each two adjacent metal layer; the intermediate metal layer is provided with a feeding structure, and the other two metal layers are provided with vivaldi antenna radiation structures electrically connected to the feeding structure; and the two vivaldi antenna radiation structuresare symmetric along the center line of the antenna to realize the double-grooved vitaldi structure, which effectively improves low-end standing waves, so that the antenna has a good high-frequency cross-polarization level and has a relatively high isolation degree. Meanwhile, by arranging a clamping groove in the center line position of each antenna, the orthogonal connection of two vivodi antennas can be realized by using the clamping grooves to form a dual-polarized probe, and the vivaldi structures are respectively arranged on the two sides of each clamping groove to avoid destroying the circular back cavities of the vitaldi structures. The phase centers of the two antennas of the probe can be aligned without destroying the circular slit back cavities of the vitaldi structures.

The invention provides an anti-interference method comprising steps of: acquiring the optimal decision threshold value of a signal on the basis of the frequency division characteristic of OFDM technology used by a TD-LTE system; determining, by using the optimal decision threshold value, whether interference exists in a frequency-domain subcarrier corresponding to a signal received by the receiving end of the TD-LTE system, and reassigning, if yes, a signal carried by the subcarrier subjected to interference to the subcarrier without interference, namely reassigning the spectrum resource without interference. Thus, the anti-interference method may avoid interference when signals are transmitted to increase the reliability of signal transmission and achieve an anti-interference purpose.

The invention provides a structured light projection device which comprises a light source and a pattern generator. A light beam emitted by the light source forms structured light patterns through the pattern generator, and the structured light patterns are emitted outwardly. The structured light patterns are changed in at least one dimension, so that the structured light patterns can be distinguished when at least a part of a number of structured light patterns are overlapped in at least one dimension. Compared with a depth camera disclosed in the prior art, the depth camera provided by the invention has the advantages that the problem of interference is solved from the source; the structured light patterns emitted by a projection module are changed, so that the structured light patterns can vary along a certain dimension; when the measurement spaces of a number of depth cameras are partially overlapped, the structural light patterns in the overlapping area can still be clearly distinguished; the acquisition of a depth image is not influenced by pattern overlapping; and anti-jamming is realized.

The invention belongs to the field of electrical equipment, and particularly relates to an electric vehicle and a bus control system thereof. According to the electric vehicle and the bus control system of the electric vehicle, two difference circuit modules are added in an original bus control system, located at the two ends of an original bus, and connected with a control module and a function module respectively to convert original transmission signals to difference signals for transmission, namely the difference signal transmission mode is used for effectively solving the problem that bus transmission signals are easily interfered by EMI and are disorderly controlled in the bus control system, the purpose of preventing interference is achieved, and the bus control system of the electric vehicle is safer and more reliable.

The invention discloses an anti-interference electrochemical sensor and a testing method thereof. The anti-interference electrochemical sensor comprises an electrode substrate and an insulating substrate and also comprises an insulating cover plate, wherein a working electrode and a reference electrode are arranged on the electrode substrate, a sample hole is formed in the insulating substrate, and the insulating cover plate is coated with a biological chemical reagent. During testing, an interferent in a sample solution to be tested is firstly consumed on the working electrode, then the biological chemical reagent produces chemical reaction with a target analyte in the sample solution to be tested through contact between the biological chemical reagent on the insulating cover plate and the sample solution to be tested, a reaction product is generated and produces electrochemical reaction on the working electrode, accordingly the interferent and an electrochemical current signal of thereaction product are separated in time, and the anti-interference purpose is achieved.

The invention discloses a cognition anti-interference communication method based on a reinforcement learning algorithm. Firstly, spectrum sensing is utilized for obtaining an interference-free channeland power, subsets in which different frequency channels and transmitting power are combined are formed, an index value of each subset is marked, and all the subsets form a candidate resource set; then at an initial moment, each node traverses all the subsets, and a metric of the node for each subset is calculated, so that a set of the metrics of all the subsets corresponding to the node is obtained; then the node selects a subset corresponding to a maximum metric from a set of corresponding metrics, and the metric corresponding to the subset is updated; and finally performing iterative computation on the metric in a time range T, wherein the subset corresponding to the maximum metric can enable throughput of the node to be maximized. The cognition anti-interference communication method disclosed by the invention learns an optimal strategy by utilizing the reinforcement learning algorithm, and each node performs independent adjustment, channel selection and power distribution, so thatthroughput of an anti-interference communication system is maximized and the anti-interference aim is achieved.

The present invention discloses an electrical stimulation method for observing rat craniotomy motor cortex with the adjustable waveform and amplitude. The method is characterized in that: the motor area of the cerebral cortex is an advanced nerve center for regulating the body motor function, and, through the downward pathway of the pyramidal and extrapyramidal system, controls activities of the brain stem and spinal motor neurons, so as to control muscle movement. Corresponding effects occur after cortical electrical stimulation, experimenters attempt to, through the electrical stimulation of the motor area of the cerebral cortex, cause the effect of body movement, and observe the phenomenon of functional localization of the motor area of the cortex. The rat is fixed to a stereotaxic apparatus, the bone windows are opened, a cortical electrical stimulation using microelectrode is performed, and the electrode is inserted vertically into the position 1.8 mm below the cortex, and adjusted within a range of +/- 200 um so as to cause the maximum movement of the contralateral forelimb, facial hair and neck corresponding to the stimulation points. An electrical stimulator with the adjustable waveform and amplitude is further produced, is capable of accurately completing the experimental observation of electrical stimulation predetermined by experimenters, and provides technical support for the experiment.

The invention discloses an unmanned aerial vehicle anti-interference method combining trajectory planning and spectrum decision. The method comprises the steps that S1, performing modeling on the lossand optimization problem of an unmanned aerial vehicle user for an actual communication scene; S2, dividing the optimization problem into two aspects: trajectory planning and spectrum decision; firstly, using a convex optimization solving method for planning a track of an unmanned aerial vehicle user, then molding a frequency spectrum decision problem into a Stackelberg game, carrying out balanced solving by hierarchical learning, and finally achieving joint optimization of the track and the frequency spectrum. The two dimensions of trajectory optimization and frequency use decision can be jointly optimized, the anti-interference target of the unmanned aerial vehicle user is achieved, the communication benefit of the unmanned aerial vehicle is further improved, and the unmanned aerial vehicle user can efficiently complete the target communication task under the condition that the flight energy consumption is limited.

The invention discloses a capacitive touch frequency hopping system and a frequency hopping processing method. The capacitive touch frequency hopping system comprises a microprocessor, a register and a frequency hopping module which are electrically connected with one another, the frequency hopping module has a plurality of different oscillation main frequencies, two different main frequencies are used in a combined mode, and according to different use environments, a microprocessor (1) sends out a judgment signal to a register, the register triggers two corresponding different main frequencies in a frequency hopping module to be switched to achieve the anti-interference purpose, a plurality of oscillation modules are arranged, the microprocessor (1) sends out the judgment signal to the register according to the application environment, the register triggers two corresponding oscillation modules, the main frequencies of the two oscillation modules are mutually switched, the anti-interference purpose is achieved, in addition, the multiple oscillation modules can form multiple combinations, and the application range is wider.

The invention discloses a vehicle and a communication circuit used for the same. The communication circuit comprises a first processor used for outputting a first voltage signal; a voltage following unit used for following the first voltage signal; a switch unit with the control end connected with the output end of the voltage following unit, the first end grounded through a first resistor and a second end connected with one end of a communication line; a second processor; and a comparison unit with a first input end thereof connected with the other end of the communication line and one end ofa second resistor, separately. The comparison unit is used for outputting a second voltage signal to the second processor based on the first voltage signal and a reference voltage. Therefore, the circuit can keep the voltages at the two ends of the first resistor same through the voltage following unit, accordingly keeps current following through the first resistor, the second resistor and the switch unit unchanged, and further keeps the voltage received by a signal reception module unchanged. An anti-interference purpose not only can be realized to enable communication to be more stable, butalso the switch unit is protected against over-burning due to over-current.

The invention belongs to the field of electrical equipment, and particularly relates to an electric vehicle and a bus control system thereof. According to the electric vehicle and the bus control system of the electric vehicle, two voltage conversion modules are added in an original bus control system, and the voltage conversion modules are connected between a control module and a bus and between a function module and the bus respectively so as to improve the amplitude value of original bus transmission signals. The original bus transmission signals are sent by a signal sending end, the amplitude value of the original bus transmission signals is improved to a value through one voltage conversion module, and then the original bus transmission signals are transmitted to the other voltage conversion module through the bus, the other voltage conversion module recovers the amplitude value of the signals to an original value and then sends the signals to a receiving end, and therefore the interference resistance of the bus control system of the electric vehicle is greatly improved, and normal use and maintenance of the electric vehicle are achieved.

The invention discloses a deviation correcting device for a knee arthroscopy. The deviation correcting device comprises a lead, a photoelectric sensor, a direction sensor, a first gear, a second gear,a transmission device, an arthroscopy image acquisition device and a processing device, wherein the arthroscopy image acquisition device and the direction sensor are integrally formed, the processingdevice is in electrical connection with the direction sensor, acquires a direction signal, and outputs a control signal to the transmission device, the processing device is in electrical connection with the transmission device, the first gear connected to an output shaft of the transmission device is occluded with the second gear on the photoelectric sensor, and the photoelectric sensor is in electrical connection with a backstage display device. The deviation correcting device for the knee arthroscopy has the beneficial effects that an operator can observe conveniently, the efficiency is improved, and the misoperation is reduced.

The invention provides an anti-harmonic negative ion lamp. The anti-harmonic negative ion lamp comprises a ceiling lamp panel, a light-emitting plate, an LED light source circuit board, an LED lamp strip, a negative ion purifying and releasing block, a negative ion generator, a crystal lampshade, an insulating wall plate, a shielding plate and a grounding wire. According to the anti-harmonic negative ion lamp, components of the negative ion lamp are subjected to insulation treatment, non-conductor materials are selected as materials, so that the negative ion generating part and other parts of the lamp are completely shielded and are grounded at the same time, and therefore the anti-interference aim is realized, and the anti-interference degree is the highest on the premise of not influencing illumination and releasing negative ions.